6-Pin DB9 Terminal Block Header [PWHD6] - $4.50 : Serial Data Communication by U.S. Converters LLC
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Break Out Board, Easy Connection DB9 Male Header Durable Screw 9 Pin Communication Terminal Block for RS232 for RS485 : Amazon.co.uk: DIY & Tools
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BUELEC DB9 Female and Male Connector in One Breakout Board,RS232/RS485/CAN/RS422 with DB9 Connector to Terminal Board Signal Module
Connector DB9 RS232 D-SUB Female Adapter 9-pin Port Adapter to Terminal Connector Signal Module With case(Female Connector, DB9 5+5 With case A)
D-SUB DB9 Male 9Pin Black Cover Screw Type Breakout Terminals Connector CK
StarTech.com RS422 RS485 Serial DB9 to Terminal Block Adapter - 1 x DB-9 Male Serial - Terminal Block - DB92422 | Novatech
DB9 to Terminal Block Adapter - Uniqmac Technologies